Front-wheel-drive vehicle gearbox

Abstract

The invention relates to a front-wheel-drive vehicle gearbox which comprises a transmission mechanism and a gear shifting mechanism; an input shaft is a gear shaft; first-gear driving teeth, second-gear driving teeth, third-gear driving teeth and fourth-gear driving teeth which form a whole body with the shaft are formed on the gear shaft; the input shaft is in interference fitting to fifth-gear driving teeth and sixth-gear driving teeth; a first-gear driven gear, a second-gear driven gear, a third-gear driven gear, a fourth-gear driven gear, a fifth-gear driven gear and a sixth-gear driven gear loosely sleeve an output shaft; the output shaft is provided with a first and second gear synchronizer, a third and fourth gear synchronizer and a fifth and sixth gear synchronizer; a forward gear output gear is fixedly connected with the output shaft and is engaged with a main reduction gear; a reverse gear shaft is provided with a reverse gear synchronizer and is loosely sleeved with a reverse gear transmission gear; the reverse gear transmission gear is engaged with the first-gear driven gear on the output shaft; a reverse gear output gear is fixedly connected with the reverse gear shaft and is engaged with the main reduction gear.

Description

technical field [0001] The invention relates to an automobile transmission, in particular to a front-wheel drive automobile transmission. Background technique [0002] Increasing the number of gears in the transmission can improve the power and economy of the car. In recent years, in order to reduce fuel consumption, manual transmissions on the market have become a development trend with six-speed transmissions. The common six-speed manual transmission mainly adopts a two-shaft layout structure with a single input shaft and a single output shaft. There are gear synchronizers, some of these synchronizers are used for gear conversion between driving gears, and some are used for gear conversion between driven gears. In order to improve the synchronization efficiency of the synchronizer and increase the reliability of the synchronizer, the synchronizer is usually required to have a larger torque capacity, and increasing the torque capacity often results in a larger average radi...

AI Technical Summary

Problems solved by technology

However, the increase in the average radius of the friction cone surface of the synchronizer will lead to an increase in the radial dimension of the synchronizer. Once the radial dimension of the synchronizer on the input shaft and output shaft becomes larger, it will cause the radial dimension of the entire transmission to increase. The enlarged transmission is difficult to be reasonably installed in the already crowded and narrow engine room of the car, so the only way to increase the space of the engine room is to match the engine torque of the whole vehicle with the same torque, and the radial dimension of the transmission increases, causing the overall Difficult car layout, increased volume and weight, and increased cost, which is not conducive to the miniaturization design of the engine room

At present, in order to solve the problem that the synchronizers on the two shafts form space-occupying interference due to the increase in the radial dimension of the synchronizer on the input shaft and the output shaft, the diameters of the input shaft and the output shaft are usually designed to be relatively small. But the result of this is that the stiffness of the shaft is reduced

When the transmission is working, due to the action of circumferential force, radial force and axial force on the gear, especially the torque and bending moment on the output shaft, the greatest influence on the work of the gear is the deflection of the shaft in the vertical plane and the shaft in the vertical plane. The rotation angle in the horizontal plane, once the stiffness of the shaft decreases, especially the insufficient stiffness of the output shaft, it will destroy the correct meshing of the gears, which will have a significant adverse effect on the strength, wear resistance and working noise of the gears, resulting in the service life of the gearbox reduce

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